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See more synonyms for intercalate on Thesaurus.com
verb (used with object), in·ter·ca·lat·ed, in·ter·ca·lat·ing.
  1. to interpolate; interpose.
  2. to insert (an extra day, month, etc.) in the calendar.
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Origin of intercalate

1605–15; < Latin intercalātus past participle of intercalāre to insert a day or month into the calendar, equivalent to inter- inter- + calā- (stem of calāre to proclaim) + -tus past participle suffix
Related formsin·ter·ca·la·tive, adjectiveun·in·ter·ca·lat·ed, adjective


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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words


Examples from the Web for intercalate

Historical Examples

  • To prevent this it was customary at regular intervals to intercalate days or months.

    History of Astronomy

    George Forbes

  • The present appears the fittest place in which to intercalate remarks concerning them.

    Luck or Cunning

    Samuel Butler

  • So far it would suffice, in accounting for the facts, to intercalate between A and B a few terms, which would remain discrete.

  • The rule was to intercalate a day in every fourth year (quarto quoque anno).

British Dictionary definitions for intercalate


verb (tr)
  1. to insert (one or more days) into the calendar
  2. to interpolate or insert
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Derived Formsintercalation, nounintercalative, adjective

Word Origin

C17: from Latin intercalāre to insert, proclaim that a day has been inserted, from inter- + calāre to proclaim
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for intercalate


"to insert a day into the calendar," 1610s, from Latin intercalatus, past participle of intercalare "to proclaim the insertion of an intercalary day," from inter- "between" (see inter-) + calare (see calendar). Related: Intercalated; intercalating.

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Online Etymology Dictionary, © 2010 Douglas Harper